Fast deterministic approximate and exact parallel sorting
Fast deterministic approximate and exact parallel sorting
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快速确定性近似和精确并行排序
DOI:
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发表时间:
1993
期刊:
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通讯作者:
R. Raman
中科院分区:
文献类型:
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作者:
T. Hagerup;R. Raman
Padded sorting requires n input keys to be output in sorted order in an array with slightly more than n locations, unused locations being filled with a special null value. We show that a deterministic CRCW PRAM with h processors can padded-sort n keys in ~(log log k)s . 2°(*0g” ‘-lOg* ‘+1) time, for any k with 4 s k s n, which is close to a known lower bound of Q(log n/log k). As a consequence, we are able to improve the best previous result on deterministic sublogarithmic standard sorting. Other results include deterministic algorithms with optimal speedup for approximate prefix summation and for padded-sorting independent uniformly distributed random variables. In the first case the running time is O((log log n)4/log log log n), and in the second case the average running time is O((log log log n)4 /log(4) n).